/brz/remove-bazaar

# Copyright (C) 2019 Jelmer Vernooij <jelmer@jelmer.uk>

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; version 3 of the License or

# (at your option) a later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

"""Mercurial foreign branch support.

Currently only tells the user that Mercurial is not supported.

"""

from __future__ import absolute_import

from ... import (

    controldir,

    errors,

    )

from ... import version_info  # noqa: F401

class MercurialUnsupportedError(errors.UnsupportedFormatError):

    _fmt = ('Mercurial branches are not yet supported. '

            'To convert Mercurial branches to Bazaar branches or vice versa, '

            'use the fastimport format. ')

class LocalHgDirFormat(controldir.ControlDirFormat):

    """Mercurial directory format."""

    def get_converter(self):

        raise NotImplementedError(self.get_converter)

    def get_format_description(self):

        return "Local Mercurial control directory"

    def initialize_on_transport(self, transport):

        raise errors.UninitializableFormat(self)

    def is_supported(self):

        return False

    def supports_transport(self, transport):

        return False

    def check_support_status(self, allow_unsupported, recommend_upgrade=True,

                             basedir=None):

        raise MercurialUnsupportedError()

    def open(self, transport):

        # Raise NotBranchError if there is nothing there

        LocalHgProber().probe_transport(transport)

        raise NotImplementedError(self.open)

class LocalHgProber(controldir.Prober):

    @classmethod

    def priority(klass, transport):

        return 100

    @staticmethod

    def _has_hg_dumb_repository(transport):

        try:

            return transport.has_any([".hg/requires", ".hg/00changelog.i"])

        except (errors.NoSuchFile, errors.PermissionDenied,

                errors.InvalidHttpResponse):

            return False

    @classmethod

    def probe_transport(klass, transport):

        """Our format is present if the transport has a '.hg/' subdir."""

        if klass._has_hg_dumb_repository(transport):

            return HgDirFormat()

        raise errors.NotBranchError(path=transport.base)

    @classmethod

    def known_formats(cls):

        return [LocalHgDirFormat()]

class SmartHgDirFormat(controldir.ControlDirFormat):

    """Mercurial directory format."""

    def get_converter(self):

        raise NotImplementedError(self.get_converter)

    def get_format_description(self):

        return "Smart Mercurial control directory"

    def initialize_on_transport(self, transport):

        raise errors.UninitializableFormat(self)

    def is_supported(self):

        return False

    def supports_transport(self, transport):

        return False

    def check_support_status(self, allow_unsupported, recommend_upgrade=True,

                             basedir=None):

        raise MercurialUnsupportedError()

    def open(self, transport):

        # Raise NotBranchError if there is nothing there

        SmartHgProber().probe_transport(transport)

        raise NotImplementedError(self.open)

class SmartHgProber(controldir.Prober):

    # Perhaps retrieve list from mercurial.hg.schemes ?

    _supported_schemes = ["http", "https"]

    @classmethod

    def priority(klass, transport):

        return 90

    @staticmethod

    def _has_hg_http_smart_server(transport, external_url):

        """Check if there is a Mercurial smart server at the remote location.

        :param transport: Transport to check

        :param externa_url: External URL for transport

        :return: Boolean indicating whether transport is backed onto hg

        """

        from breezy.urlutils import urlparse

        parsed_url = urlparse.urlparse(external_url)

        parsed_url = parsed_url._replace(

            query='cmd=capabilities', path=parsed_url.path.rstrip('/') + '/hg')

        url = urlparse.urlunparse(parsed_url)

        resp = transport.request(

            'GET', url, headers={'Accept': 'application/mercurial-0.1'})

        if resp.status == 404:

            return False

        ct = resp.getheader("Content-Type")

        if ct is None:

            return False

        return ct.startswith("application/mercurial")

    @classmethod

    def probe_transport(klass, transport):

        try:

            external_url = transport.external_url()

        except errors.InProcessTransport:

            raise errors.NotBranchError(path=transport.base)

        scheme = external_url.split(":")[0]

        if scheme not in klass._supported_schemes:

            raise errors.NotBranchError(path=transport.base)

        from breezy import urlutils

        external_url = urlutils.strip_segment_parameters(external_url)

        # Explicitly check for .hg directories here, so we avoid

        # loading foreign branches through Mercurial.

        if (external_url.startswith("http:") or

                external_url.startswith("https:")):

            if klass._has_hg_http_smart_server(transport, external_url):

                return SmartHgDirFormat()

        raise errors.NotBranchError(path=transport.base)

    @classmethod

    def known_formats(cls):

        return [SmartHgDirFormat()]

controldir.ControlDirFormat.register_prober(LocalHgProber)

controldir.ControlDirFormat.register_prober(SmartHgProber)